A human RBC is placed in 1.5% salt solution. It will

• swell up

• shrink

• remain unaffected

• burst

Assertion : The regulation of RBC production is accompanied by the kidneys.

Reason : Erythropoietin hormone circulates to the red bone marrow, where it increases stem cell mitosis and speeds up the development of RBCs.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both the assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both the assertion and reason are false.

Identify the correct statement regarding cardiac activity

• Normal activities of the human heart is regulated intrinsically hence it is neurogenic

• A special neural centre in the medulla oblongata can moderate the cardiac function through the CNS

• Parasympathetic neural signals increase the rate of heart beat

• Adrenal medullary hormones can increase cardiac output

• Adrenal medullary hormones can increase cardiac output

Three alleles namely I^A, I^B and i control the blood grouping in human beings. How many different genotypes are likely to be present in the human population?

• 2

• 4

• 5

• 6

• 6

Assertion: WBCs accumulate at the site of wounds by diapedesis.

Reason : It is the squeezing of leucocytes from
the endothelium.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both the assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both the assertion and reason are false.

Choose the correct statement among the following

• Atrio-ventricular node is the pace maker that generates action potential and initiates the atrial systole

• During each cardiac cycle, the 'lub' sound is due to the closure of semilunar valves

• Stroke volume in each cardiac cycle is approximately 170 ml of blood

• QRS complex in an ECG indicates depolarisation of ventricles

• QRS complex in an ECG indicates depolarisation of ventricles

What is the pO₂ and pCO₂ in the systemic arteries?

• pO₂ 40 mm Hg; pCO₂ 45 mm Hg

• pO₂ 95 mmHg; pCO₂ 104 mm Hg

• pO₂ 95 mm Hg; pCO₂ 40 mm Hg

• pO₂ 45 mm Hg; pCO₂ 40 mm Hg

• pO₂ 45 mm Hg; pCO₂ 40 mm Hg

All veins carry deoxygenated blood except

• pulmonary vein

• hepatic vein

• hepatic portal vein

• renal vein

Choose the wrong statement

• Solubility of CO₂ in blood is 20-25 times higher than that of O₂

• The total volume of air accommodated in the lungs at the end of a forced inspiration is called the vital capacity

• O₂ can bind with haemoglobin in a reversible manner to form oxyhaemoglobin

• Every 100 ml of deoxygenated blood delivers approximately 4 ml of CO₂ to the alveoli

• Every 100 ml of deoxygenated blood delivers approximately 4 ml of CO₂ to the alveoli

Which of the following is wrongly matched?

• Haemoglobin in mammals - RBC

• Haemozoin - Plasmodium cytoplasm

• Haemocyanin- prawn

• Haemoglobin dissolved in blood - Pheretima